<html><head></head><body lang="en-GB" style="background-color: rgb(255, 255, 255); line-height: initial;"> <div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Hi Alan,</div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Our local fire code requires a minimum of 50 lux or 5 foot candles be maintained in hallways at all times, so this is something you may wish to investigate further. <span style="font-size: initial; line-height: initial; text-align: initial;">And with 7 to 9-watt A19 LEDs now producing about as much light as a 60-watt household incandescent, there might not be a whole lot to be gained at the end of the day.</span></div> <div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">As another point of comparison, a 2-lamp F32T8 wall cube or wrap equipped with two 12-watt InstantFIT T-LEDs powered by a NEMA Premium 0.77 BF ballast draws approximately 23-watts and supplies 2900 lumens, or over125 lumens per watt. That's about as much light as you would derive from two 100-watt incandescents, and the numbers continue to improve with each passing year, e.g., Philips has publically announced that they expect their InstantFIT T-LEDs to hit the 200 lumen per watt mark in the not too distant future. </div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">And my apologies for the previous blank reply -- I'm all thumbs this evening. </div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Regards,</div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Paul</div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div> <div style="font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Sent via my BlackBerry Q10 | Ce message envoyé avec mon BlackBerry Q10<br> </div> <div id="_originalContent" style=""><br>Hi Paul (or other electrical wizards)-<br><br>do you have any experience retrofitting hotel or multifamily corridor<br>lighting with occupancy sensors? For example, what are the code<br>limitations--minimum lighting levels when not actuated, hours of operation,<br>etc...<br><br>I've stayed in apartment bldgs in Europe where corridor lights were<br>completely off, all the time, unless actuated. I am also aware that<br>California was considering a mandate for dual level systems a few years<br>ago, with limited hours of operation, but I don't know what became of it.<br>IIRC, they would have required one lumen per square foot, when not actuated.<br><br>-aa<br><br>Alan Abrams<br><br>*certified professional building designer, AIBDcertified passive house<br>consultant, PHIUS*<br>*certified passive house builder, PHIUS*<br>cell 202-437-8583<br>alan@abramsdesignbuild.com<br>HELICON WORKS *Architecture and Education*<br><http://www.heliconworks.com/index2.html><br><br></div></body></html>